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The close connection between matter (more generally energy density whether it be matter or radiation) and time can be be seen in the theories of relativity. Conventional classical physics is extended into the more general spacetime by extending vectors, such as momentum, into vectors with both space AND time...
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Best answer: The close connection between matter (more generally energy density whether it be matter or radiation) and time can be be seen in the theories of relativity. Conventional classical physics is extended into the more general spacetime by extending vectors, such as momentum, into vectors with both space AND time components. For example, classical 3-momentum is extended into a reference frame invariant 4-momentum by adding a component of momentum in the direction of time. The time component of 4-momentum multiplied by a constant ‘c’ is total relativistic energy. Rest energy (e=mc^2) results from the time component of momentum in a rest frame.
So, the above is an illustration that the laws of physics take on a reference frame invariance by extending classical physics by adding time components to vectors. To the extent that relativity is correct, it would seem that matter/energy cannot be expressed properly without the consideration of time, nor can we express the invariance of the laws of physics without consideration of time.
In general relativity, Einstein argued that matter/energy were inseparable from spacetime.
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